I have my own little drain cleaning business and I came across a plumbing problem I think. Not being a plumber I would like you experts to comfirm my thoughts on the problem. Customer had a friend replace basement sink in bathroom and hooked drain line from sink to just above trap for washer drain. So when customer runs washer on spin and water runs into drain pipe it can't handle the sudden flow and backs up into bathroom sink. I snaked washer line but problem is still there. I told customer that the sink should have it's own drain line and not T into washer drain line. Is that correct ? Thank you for your help.
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